▎ 摘　　要

NOVELTY - Graphene-carbon nanotube thin film is prepared by oxidizing graphite to obtain graphite oxide, ultrasonically dispersing in deionized water for 1-2 hours to obtain 0.5-1 g/L graphite oxide dispersion (S102), ultrasonically dispersing carbon nanotube for 3-6 hours to obtain 0.2-1 g/L carbon nanotube dispersion (S103), ultrasonically mixing graphite oxide and carbon nanotube dispersion to obtain liquid mixture, removing deionized water and ethanol to obtain graphite oxide-carbon nanotube thin film (S104), heating, and cooling to room temperature (S105). USE - Preparation of graphene-carbon nanotube thin film for electrochemical capacitor (claimed). ADVANTAGE - The preparation of graphene-carbon nanotube thin film prevents agglomeration of graphene sheet, improves surface energy storage, and increases electrochemical capacity of electrode capacitor. DETAILED DESCRIPTION - Graphene-carbon nanotube thin film is prepared by oxidizing graphite to obtain graphite oxide, ultrasonically dispersing in deionized water for 1-2 hours to obtain 0.5-1 g/L graphite oxide dispersion, ultrasonically dispersing carbon nanotube for 3-6 hours to obtain 0.2-1 g/L carbon nanotube dispersion, ultrasonically mixing graphite oxide and carbon nanotube dispersion with volume ratio of 1:1-1:2 for 5-8 hours to obtain liquid mixture, removing deionized water and ethanol to obtain graphite oxide-carbon nanotube thin film, heating under inert gas atmosphere at 700-900 degrees C for 0.5-2 hours, and cooling to room temperature. An INDEPENDENT CLAIM is included for application of graphene-carbon nanotube thin film for electrochemical capacitor which involves rolling graphene-carbon nanotube thin film, drying, slicing to obtain electrode plate, and stacking to obtain electric core which is coated with outer shell containing inner electrolyte. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart for preparation of graphene-carbon nanotube thin film. (Drawing includes non-English language text). Preparation of graphite oxide (S101) Preparation of graphite oxide dispersion (S102) Preparation of carbon nanotube dispersion (S103) Preparation of graphite oxide-carbon nanotube thin film (S104) Preparation of graphene-carbon nanotube thin film (S105)